1,721,005 research outputs found
Postnatal development of 3H-rauwolscine binding sites in the dorsal lateral geniculate nucleus and the striate cortex of the tree shrew (Tupaia belangeri)
No full textNoradrenaline has been shown to play an important role within the visual system of the brain. To analyze the postnatal development of alpha2-noradrenergic receptors in the visual system of tree shrews, we localized and quantified binding sites for the antagonist [3H]-rauwolscine by in vitro-autoradiography in the dorsal lateral geniculate nucleus and the striate cortex at different postnatal ages. At birth, the dorsal lateral geniculate nucleus is only slightly labeled by [3H]-rauwolscine. During the postnatal period, the number of binding sites increases to reach a maximum around postnatal day 20. Since the young tree shrews open their eyes at approximately day 19, it appears that this high concentration of alpha2-adrenoceptors is related to eye opening. In the adult animal, [3H]-rauwolscine labeling shows a laminated pattern in the dorsal lateral geniculate nucleus. Laminae 1, 2, and 3 are more strongly labeled than laminae 4, 5, and 6. In the striate cortex, the pattern of [3H]-rauwolscine-binding sites changes dramatically during the early postnatal period. Immediately after birth, there is only one layer, located within the subplate zone, which is labeled. From postnatal day 5 onwards, all cortical layers which can be distinguished on histologically stained sections reveal [3H]-rauwolscine-binding sites, but in layer IV, which is known to receive major inputs from the dorsal lateral geniculate nucleus, there is very little labeling during the first two postnatal weeks. In this layer, a large number of [3H]-rauwolscine-binding sites occurs between postnatal day 15 and 20, that is slightly before and around the time of eye opening.(ABSTRACT TRUNCATED AT 250 WORDS
Sequencing of the GRIK1 gene in patients with juvenile absence epilepsy does not reveal mutations affecting receptor structure.
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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